Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f09a4572ab8d8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 09:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8d4fc01563bd44033f0b1532b99ad3a SHA-1: ac985b26f54e330d780ba9fee0b3f5227e4805dd SHA-256: df1f09a4572ab8d8df9b885812098883ccf19c8525ad1a2fa44dfb7815177047
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://uptownfallschurch.com/uploads/files/gafeneguzatupuxa.pdf In PDF document text
    • http://reguitti-engineering.it/userfiles/files/zijawijalum.pdfIn PDF document text
    • http://change4best.ru/upload/file/61755938144.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/xigevu.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/gijigiroxaxazer.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7c69af5e93a2347b498a558a06955e8a/tavedevabetev.pdfIn PDF document text
    • https://raljob.com/userfiles/file/fupedoxu.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/56039235074.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/61365702544.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/2786716172.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/rijoreja.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/runagutaxavulesafazes.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e56a3403c---vugovikoter.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/26804032749.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375d53b5514---75992454251.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/miwevadisugezunupotu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c218ba99---ruxizenawizewipozimukaf.pdfIn PDF document text
    • https://ghnservizi.com/file/16688562920.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/jujikotokadurufisisa.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4b140e6e---11688366476.pdfIn PDF document text
    • http://artediapharma.com/upload/files/titejivavelewesubimaf.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca0bc8c92---disigabudujuremavama.pdfIn PDF document text
    • https://mimpidia.com/contents/files/vokawibodumi.pdfIn PDF document text
    • https://sinarwaja.com/account/files/27170490374.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/98481720757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=toques+mensagens+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 19440 bytes
SHA-256: da8b62c8335effc2f0ba8d577cb3f46905bc15b0ec2e067f6b436c413e456ab2
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 10656 bytes
SHA-256: 1071b4cde4fa7720c41ec8f52331274b3c3b6de8194435a35a548d6a8f64dee7